[LoneMonad]

requirements:
11-15HCP, exactly 6 trump, 0-3 of the other major

anything else ?
what are the responses?

[effervesce]

Responses: 2♠ shows spades, 2NT shows a balanced invite, 3♣ shows clubs, 3♦ shows diamonds, 3♥ invitational with heart support.

Bidding on here is at least invitational to game, or you'd have passed 2♥. You can make a case that new suit bids are game tries for hearts and 2NT an artificial ask though I guess, but it wouldn't be 'standard'.

[y66]

Andersen and Zenkel (now Aucken) have a good discussion of 4th seat weak two-bid openings and responses in Preempts from A to Z (1993).

After p (p) 2M (p) : ? they suggest

3C asks for shortness. Opener bids short suit or 3N if short in clubs or 3M if no shortness.

new suits are invitational, not forcing and deny a fit

2N asks for high card feature

simple raises are invitational, not preemptive (responder's failure to bid 2N or 3C suggests interest in opener's general overall strength and controls)

3N and all other bids are to play.

The key to responding to 4th suit weak two-bid openings is going plus. Any minus score you get will be a disaster. Beware of game tries when the 3-level may be too high if your attempt to reach game is rejected.

Their requirements for 4th seat weak two-bids are:

10+ to 13 HCP

2 defensive tricks

A good suit (usually a 6-card suit but could be an exceptional 5-card suit or a reasonable 7-card suit).

[han]

11-15 is far too wide. I prefer 10-12, wouldn't argue with 11-13.

[ArtK78]

I have an agreement with several partners that a fourth-seat "weak 2 bid" in a major is an opening hand that would rebid the major regardless of partner's response.

Typically, a minimum to moderate opening bid with a good 6 card major suit.